Which JAR files for JUnit testing?

I am just getting started with SoapUI and I would like to run it from a Java program. What Jar files must I include in my project? I have tried the soap-4.5.0.jar but it leaves many items undefined. Can I do this with the community addition or is it restricted to SoapUI Pro? At this point a very simple HelloSoapUI.Java would be really valuable to a lot of us!

Thanks!